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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '588ff09d3c0f3f204e28bedcd04661f07fd11982c961fcffd87c2793604cf90a' 
  AND token = 'PLJtmJA5+DIq7WteN65shB5SmuJp0HUF7JQsSscCM+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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