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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '895246e0ccd6908d29bfe3fd3309ae6566c834019480d4050192a71002451a60' 
  AND token = '0xmb77jQm4hOO54AX2MZrS5E5idXas81i9UKc9rZVAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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