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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5fd0ff45f506f1827dcd92f6291e117ef245e4019cab0f994d1d659331a9b5e' 
  AND token = 'IjD1BMqkUWbGP4ABksE4Gujc3t/4/I55//F6S3pXWuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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