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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39714a63b684fe0aff891164dee40e7928ab7409574e199abeeb45be319fbeda' 
  AND token = '09akxx+BVNf5d8azEQezf3W913GS0gOPSoL52ezcQzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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