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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4adb58982bec4ef2491a85499cc598b28e89d37f6a5985915beb7f58141f74dc' 
  AND token = 'VwhWhxOoCpnztdInfo01dcFv/xZaVi6leID/MCkG0Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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