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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fe77ed770d4f3261d396edb7bac17336c3de0c996b91edfe8414fc5818eb638' 
  AND token = 'vgupL6yCFpFL9DSJ3tVESBouiuLrz48qeGKqNa7tH9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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