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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4feac95ac8c7c1d2314773639e3b3230d5014df36af799678a480cab46d2bae7' 
  AND token = '2U0IxsAsawaD0ockd9CVA7xtP1SNPKGTRbw0RK048do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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