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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6838b54641cd65369a1afdd3f907e5fafa104ae96c3e144e9b186ed070d3d60a' 
  AND token = '4QL2iNARCZBV567Pvekbh/eyYuGlX6IuaMeCe7qWh38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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