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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4992d242ec49b3e0ee61ea8b40c34899c93e240e34bb0ed583d4bc7e285da07d' 
  AND token = '3fkWhoboUq2Gw+M0rfN9ivqiJJNVIdoAp6aUsdQoiU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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