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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '152ca705dede6332eae24ea590021acd7ce1b2e7bee4045933c4f3c1e8b5bd70' 
  AND token = 'mxQwH0rZgA/YjUu4nTMcAqdb9AkSt5YO+tTttwjASm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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