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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'daf235f67eaddc07c4d8200752a84c73aa5e80894820f5d4e9961f5e9b84da34' 
  AND token = 'qrtsYY1WJZMrSLXo2zh/J0qLpYqykASZhqDeIiy96zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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