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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97293b8de12eb26d0f2eaeca394ee23c6d4c3bbde88be921062060cbb90685dc' 
  AND token = 'VxIre1W49Z4UBAqTQjejJQ9sWEkMcdq916kL5tn3ZQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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