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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8afd1e2a71f1bdb3f9be24ea9fc00e8eb68fb60707c9b8ad1006371727e8e025' 
  AND token = 'A9fx6ZUZc5FlRVHq6A2mLvRTAbJdy/rtZtDkXEMs5tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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