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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bb801cedee85f3c6188fc4ff0d7d33c2fe3bdde45752c5a9ec58df3a81c0647' 
  AND token = '6XHWLHeF80E4uIvqu37Gn9Vk5VU629vSWWYfUcgOy30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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