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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44532da5eee8cafbe75b8a2245ce25cb88ffc009f38db6b9e1adfb9798471bbe' 
  AND token = 'JoU4zYK4yASBTZDyac+BNvHE0mVom4TFhDKROSILSdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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