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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ff78c884b67dfe0d299fb050997f73079572468491e688f7f3ae6b02e0f35ac' 
  AND token = 'f8r5Ux78/N+nNYtvdniwzXQW5O+kBzpv3jYNd/rruEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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