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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6eadbb5d27f0530af39ac8c0dbb656168081b66bb86c00418374cabd9ac74e27' 
  AND token = 'KfI4+FXH9CeXP3paNy80G8yAvlvp9jKFjKyIxrl3+Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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