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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c0cc1763a1d4453e9e3f44d08ce72ec040915364e88532836e81dc42271358e' 
  AND token = 'A1DBc8Lu58XStQe79cuYgulHvf2dmJVz91qCO6WLufo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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