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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3beb64c4a99a361e51aa8463698f40d73088f69574c4fcff3832f999ac2cffe9' 
  AND token = 't3pphHHGYLkOSb1E4K5NJipLCw7l05/WAkhUPtBaBZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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