SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b0b80f88bc15c20da8fa41d72e3f121d0527738f5165ac5057d41a67a22c39b' 
  AND token = 'hccpUqht/Vg9SiyZeU+imn8XvDU6d6mwlJQSOvd0W1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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