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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5576cb78d1ff9caaa4939579cfc809bf349793cd5a58b4fae5cc5b148955daba' 
  AND token = 'Rz8RwBky9qWj2m2Oz+DwkTFnT8qRt60N0rjfuWu4Ess=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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