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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd58287df5642b237b38815680a6a3cd0cbafa3d05f6e356076dc960f758528ca' 
  AND token = 'DJd9iI7u9QorZNiCAZlPllLU62W71FRPvLXP8NWhw1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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