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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6f4798e05c746972f7f1d0030e7d11590701b2557a66bd458752a419b983746' 
  AND token = '2laO70Z3cL1oWnxncyA06ZjDNXRKVG8INfVZWQBj3bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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