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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49936045589c48f2be1aa2ad1bd41b70e4706176eb4f3df5b2519772f4d7ae17' 
  AND token = 'nN2njezYvAuPPDj8UxwUMHPas2EpFs5O2gAQbOl5RDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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