SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ee460d29d9b3c9a855bd4cee3b7267b81af0f7f83c2a73b814350f4d110b43f' 
  AND token = 'qlqfQNpRgJUOgFLn0NxQuC4uH64jl2JxlY2rpKnAJ2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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