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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47d30c8b98fe137e8bdc8e677889585724f186acce6c68232f8e08ea7bec607b' 
  AND token = 'jAbD78YoouzjN0abC5514h1N8CW8PQlHFOU8EjZRhxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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