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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13bafc531fcf59c888ae127110abbf7fa15eedadd82eb30353dd514352ea80aa' 
  AND token = 'BlO2pGj0EQPez1pH043p2krYUwDSb2Ux1HKo8H6krc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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