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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9d15c55759b5c989fad0580db505c5c8ce124803f57b0ac296fbd8e943c9cf8' 
  AND token = 'ZdN4SJHqxRMrWYa688wB/fy03Gp/39nJ5eslQ5C9VH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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