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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cde805578d971fabb5bebd5302c6e6b0c7f5f08580eb0df20e0bee7fa8a7972e' 
  AND token = 'ZT3EuaQT24hRbmcfXwyDKm8tholsON1xfIjrM+vq0sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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