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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b15f82e0b1cd910f65fa15147790c8ff864fac35e2ac9e81f8463ef1aa1acad' 
  AND token = 'rCt3quZnEq00wUYJSTnfSuk53SZr8BXducfCfas8eKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}