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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a76462b8c4331169911ae6e3c00c211caa319346a782150afbb8e8f820953cb' 
  AND token = 'A0B99CTv2vAzmaUhbi6DA1RI80StUfLfbI4BZI2QR+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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