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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6df012ca92b9ff8d40ff67575b43cdd65a8c7c3d1c981224f2870be9fa6dbbb' 
  AND token = 'bRQeRYio9XYWHtDbwRDbOLE2oMWKZd8kSMP+PdDslwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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