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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cae6780b562c4a09a49ba94df65ee1343a4e88a9329235ea7463ba316b4d280' 
  AND token = 'C6bAn3jJphxbafeffa99R5OjTCUBZSAKJoV3lm4kc1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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