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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18c4dcd145c86f2c1791f3457cfd4ee5e5079563e1495ceb762ae41fd48f1aa5' 
  AND token = 'TUMxYznSQpPar4Xg7ewruzLVBRQTGHF4M1aikfSZ21Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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