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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '656c503aa6d54eafff74b28971223e24acd7e803d23a558dc730ccd6d5b7373b' 
  AND token = 'RC5n0BnI8QU4u3OREuadiMR2sT0DwQdRdsu2V524xmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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