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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d88f8bf64efcb044245e8193e68601c455b78a065e00dc3198f5abb6dad475d' 
  AND token = 'UwuDQL025/4YjpqFOXrWaP4ZiPvLuoYHkft9paqlnrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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