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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39a05d4be7101c24ff547ced0442622516e799acf4f2bff76ab85dad004d8da9' 
  AND token = 'zDKBUu3l9pYSoZ2oyeSmywTIsHWdupvq5/63ZcyFkyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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