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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3a82acdcc13447f333c7981d01bf3dc24d8d791c280116ea9da6f6edca573eb' 
  AND token = 'ILZ6GsE5RqerI6xuj9YWjdldMjFX5OfhOU47meQ9a/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00168

JSON explain

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