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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61f75af61b04f69cfa44f9b412da7b94c228541c21fdc2ae9de0e280c0b38283' 
  AND token = 'sfsjTCgOEtChOUM/ksbNLZJkLr5llQI3dDUSU0qUWh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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