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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f2eaff31d06996b6ce98a23d2c640e3bc94c21dc0f676d3c65e73be705276af' 
  AND token = 'pbrMsAl685U6R9rd1QRwgp7CxC9TYY8U61/Ma/J4h1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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