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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9f1aa3699efce74b6a4e3b30eba3944a5f906a02142da128f666daad7059886' 
  AND token = 'syqfii7J0ZF07maNweMAriVsUXqIhcJXNf3+gFKAOs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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