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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3394895338d10ec75c199d38e836c92a627d2972f61731399526664d4712d5c7' 
  AND token = 'RRfp1dsyCWbO3yY4WjtjqDmPNTH40juWz83YYXYY1bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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