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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0463c2404365f87826eb2dd34aa5ae43e826e21cfa7dd136b01d12978f4a92d' 
  AND token = 'yDqk4Pncistf5S5s4BGEv39OgZObr3f2vb583RLYSC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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