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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82bcd0782b48f8a6863ba502353152c6e942d65842b61228add47fd35e15587c' 
  AND token = 'PmLtKYHifcv6IHKG0f46iYDyi+jSALypCC6k4Ysfreg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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