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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b50b85f7e8fbc5e36ff8f7ddf405b576d450150d4c1ad6f1bae32910c3525784' 
  AND token = 'zLOycfC3NkjCF3UNIivtsCTe+m9zpAsV0bqyydQYNLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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