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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c7b0e4a89ef6322739e791381627e2ae4f93d8bb70a6e47b319647b8946d8e2' 
  AND token = 'ljjpwuMPHifuZU2wd2pbjWRgbtFZ/r+VVaHMfSjBn44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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