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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a467fb8a141adfa26e2168e50c57a0305b20bfcaf2ab0e41c887e12f76e1f65f' 
  AND token = 'yPVTfdN+xzsMY98mdaQRqZdNCeLaX7npf+/tmjfJiNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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