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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5c98bf71c46e41e396b74093079d7bbf3010b78bc4db4a6e56d71e04d63058a' 
  AND token = 'yPF5LyTQMIoxZvlWcIQpcrQhfpyl3eh+gHAaWwZbOrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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