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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '248d680b0eecc0876e456dd48f75136623d15ae5013acbd18978823a37c0d270' 
  AND token = 'G5GnO2lNgpp7uCGa0LIysgIjc4ek0OGEx3YTp3aJFH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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