SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ff13fe859cd678f0fe89fefb0e6fa6ab1d2307237249f0f596a735395683050' 
  AND token = 'vNqHKLouPQE27NER3lir9XBMUlxPzOVxv/vKaDqoIvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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