SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0491f809af6167a27ad7a79361557a988bc9ff3b8e93a42291c83002d3d258f7' 
  AND token = 'uhaon8/jeTAzQyUV2uNPGO1roZFFmg+nYtJLZp0R6es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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