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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a2693c4b1008d56bd9fe6b766c932453785830edb13e1905ca8c05fd4ae8b14' 
  AND token = '5mwxBf9d+dg/3EmIsis1La9RdiucBZSUTv+G530Mx/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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