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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec433ebe96ae993cfb903b2c856dc023b4bfc715e55a04fc1ae6a8a31215e8b3' 
  AND token = 'Yan2rOZ2oFc8ENs85eoxgtVubMbo3xlzFxtlHdfjn9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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