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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95d590f9e644a3cc0d920501abc34d71a0b026a64bda72ced081ae31b04d20b2' 
  AND token = 'mDd5Wcm2dXt4TONRq8kBLLIrbbqRg8odQC4Zjb6CMPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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