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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '816a7c2f506c78923900af64d8a48e8f3ffd946c3b1dadfc3fe899803fc0ef05' 
  AND token = 'fNLe3d91lXgbUcWwI3NhqYI+4VomHOU4is+aV0IiQ8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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