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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81f242cd245951478684b87dd7d8495e00c1eb7f48e3d76aec8539290ce78306' 
  AND token = 'Dj8Mb565DiolX25luXI9LIBtiuWVfigKK4DHljWqi+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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