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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b783edf97bfe674a8f84f8c684831df6013baba62b18d75d2025f3ecc9ff7a8' 
  AND token = '1ZR7QJDwGzlqrbEiv01yT/lTH1YnAEQ+7xHfvqQfr6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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