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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '660feebd09c9919f1c0e27c98ab9927ff8f85c2d541c1e85fd571193bba48604' 
  AND token = 'BJL9XMi66jCiIKGnT5RU+1g9EcJTGTE1PABL3Hjdm5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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